Very important that he has raised this and why on earth are people criticising him for taking two years?
It's really important that people know that they are at risk from oral and anal sex from HPV infection. The HPV vaccine does not cover all strains and we won't know for many years if it does reduce rates. On the "Friday night" anal sex threads on here you see such a worrying amount of people saying they have unprotected anal and think it is OK because they are in a long term relationship, they have no idea about how HPV can be transmitted years after infection.
Fact is, there has always been lots of smoking and drinking in populations, probably previously more use of alcohol as a mouth wash too. Yet rates of mouth and throat cancer are rising. Change in sexual habit is a possible factor and people have the right to be informed about it.